If you're doing a lot of research but don't want to overload your bookmarks bar, ZipTabs is a Chrome extension that will download and archive all your open tabs for later viewing.

The extension also requires another Chrome extension, SingleFile Core to work, but with both extensions installed, ZipTabs puts a small button on your toolbar that enables you to download and archive any open page quickly. It downloads the whole page, images and all, so if you have a bunch of tabs open and need to save them for later or offline reading, it's a handy extension to have around.